No. 64] 



DIPTERA OF CONNECTICUT: TAXONOMY 



193 



when females fly from nearby shrubbery into the swarms. Adults are 

 frequently found resting on windows in houses or resting on tree 

 trunks in the open. 



Key to Species 



1. Wings with cell Mi pointed at base, i>i connecting with Ali+n at fork; wing- 



tip clear marginatus 



Wings with cell Mx truncated at base, m connecting with M-z some distance 

 beyond base; wing-tip with distinct brown markings, heaviest in radial field 2 



2. Pale spot in outer radial field white, clearly delimited ; a very small dark spot 



in cell R beneath the fork of Rs; median mesonotal stripe divided, .alternatus 

 Pale spot in outer radial field dirty white or yellowish white, its limits ill- 

 defined; no dark spot in cell R beneath the fork of Rs; median mesonotal 

 stripe entire ... .fenestralia 



jfl ^1 + 2+3 



Cii, M 



K1 + 2+ 



Figure 21. Anisopodidae ; venation. 



A. Anisopus foiestralis (Scop.) B. Axymyia furcata McAtee 



C. Mycetobia divergens Walk. 



Symbols: Cu, Cubitus; M, Media; R, Radius; Sc, Subcosta. 



Anisopus alternatus (Say) 



1823. Rhyphus alternatus Say; Journ. Acad. Nat. Sci. Philadelphia, 



3 : 27. 

 1918. R. alternatus Baerg; Ent. News, 29: 354; Alexander, Cfls. 



N. Y., 1: 888; 1919. 



Figs.— Dickinson, Cfls. Wise, p. 152, fig. 29 (head), p. 172, fig. 39 (wing); 

 1932. 



i 9 . L. 4-4.5 mm.; w. 5.5-6 mm. 



(Apr.-June; Sept.) Ont., Que., Me., N. H., Mass., R. I., N. Y., N. J., Pa., westw. to 

 Wise, and Kan. 



Connecticut.— Branford, June 27, 1904 (H.L.V.); New Haven, March 28, 1925 

 (G. M. F.), May 25, 1919 (W. E. B.), July 1, 1928 (W. E. B.) ; Orange, pupae in 

 slime mold, June 8, 1920, emerged June 12-14 (M. P.Z.); Stamford, Apr. 4, 1929 

 (B.T.R.L.). 



